News tagged with fluorescence

Waking up the visual system

The ways that neurons in the brain respond to a given stimulus depends on whether an organism is asleep, drowsy, awake, paying careful attention or ignoring the stimulus. However, while the properties of ...

Oct 03, 2014
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New infrared marker for bio-imaging

The recently developed fluorescent protein Amrose is now being used for advanced near-IR imaging procedures. With the aid of a novel evolutionary platform technology, scientists at the Helmholtz Zentrum München have developed ...

Sep 09, 2014
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Watching the brain do its thing

To a large extent, the brain remains a black box. Taking it out of its case inside the skull and examining it—as in an autopsy—reveals some things, but not how the brain works in a living, functioning ...

Apr 03, 2014
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Environmental design Rx for RN workplaces

Recruiting and retaining nurses might be easier if hospital workplaces were more hospitable, reports a team of environmental design specialists who offer a 10-point prescription for those hardworking medical professionals.

Feb 20, 2014
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'Spotlight' drug detects lingering cancer cells

(Medical Xpress)—When a tumor is surgically removed, there's always a chance the cancer will return. Even the tiniest bit of malignancy left behind creates a pathway for the disease to recur—often within ...

Nov 11, 2013
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Special camera detects tumors

Tumor removal surgeries pose a great challenge even to skillful and experienced surgeons. For one thing, tumor margins are blending into healthy tissue and are difficult to differentiate. For another, distributed ...

Nov 04, 2013
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Fluorescence

Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength. It is a form of luminescence. In most cases, emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation.

The most striking examples of fluorescence occur when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible to the human eye, and the emitted light is in the visible region.

Fluorescence has many practical applications, including mineralogy, gemology, chemical sensors (fluorescence spectroscopy), fluorescent labelling, dyes, biological detectors, and, most commonly, fluorescent lamps.

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